/**
  ******************************************************************************
  * @file      startup_gd32e23x.s
  * @author    MCD Application Team (modified for GD32E23x)
  * @brief     GD32E23x devices vector table for GCC toolchain.
  *            This module performs:
  *                - Set the initial SP
  *                - Set the initial PC == Reset_Handler,
  *                - Set the vector table entries with the exceptions ISR address
  *                - Branches to main in the C library (which eventually
  *                  calls main()).
  *            After Reset the Cortex-M23 processor is in Thread mode,
  *            priority is Privileged, and the Stack is set to Main.
  ******************************************************************************
  * @attention
  *
  * <h2><center>Original File: &copy; Copyright (c) 2016 STMicroelectronics.
  * All rights reserved.</center></h2>
  *
  * This software component is licensed by ST under BSD 3-Clause license,
  * the "License"; You may not use this file except in compliance with the
  * License. You may obtain a copy of the License at:
  *                        opensource.org/licenses/BSD-3-Clause
  *
  ******************************************************************************
  */

  .syntax unified
  .cpu cortex-m23
  .fpu softvfp
  .thumb

.global g_pfnVectors
.global Default_Handler

/* start address for the initialization values of the .data section.
defined in linker script */
.word _sidata
/* start address for the .data section. defined in linker script */
.word _sdata
/* end address for the .data section. defined in linker script */
.word _edata
/* start address for the .bss section. defined in linker script */
.word _sbss
/* end address for the .bss section. defined in linker script */
.word _ebss

  .section .text.Reset_Handler
  .weak Reset_Handler
  .type Reset_Handler, %function
Reset_Handler:
  ldr   r0, =_estack
  mov   sp, r0          /* set stack pointer */

/* Copy the data segment initializers from flash to SRAM */
  ldr r0, =_sdata
  ldr r1, =_edata
  ldr r2, =_sidata
  movs r3, #0
  b LoopCopyDataInit

CopyDataInit:
  ldr r4, [r2, r3]
  str r4, [r0, r3]
  adds r3, r3, #4

LoopCopyDataInit:
  adds r4, r0, r3
  cmp r4, r1
  bcc CopyDataInit
  
/* Zero fill the bss segment. */
  ldr r2, =_sbss
  ldr r4, =_ebss
  movs r3, #0
  b LoopFillZerobss

FillZerobss:
  str  r3, [r2]
  adds r2, r2, #4

LoopFillZerobss:
  cmp r2, r4
  bcc FillZerobss

/* Call the clock system intitialization function.*/
  bl  SystemInit
/* Call static constructors */
  bl __libc_init_array
/* Call the application's entry point.*/
  bl main

LoopForever:
    b LoopForever


.size Reset_Handler, .-Reset_Handler

/**
 * @brief  This is the code that gets called when the processor receives an
 *         unexpected interrupt.  This simply enters an infinite loop, preserving
 *         the system state for examination by a debugger.
 *
 * @param  None
 * @retval : None
*/
    .section .text.Default_Handler,"ax",%progbits
Default_Handler:
Infinite_Loop:
  b Infinite_Loop
  .size Default_Handler, .-Default_Handler
/******************************************************************************
*
* The minimal vector table for a Cortex M0.  Note that the proper constructs
* must be placed on this to ensure that it ends up at physical address
* 0x0000.0000.
*
******************************************************************************/
   .section .isr_vector,"a",%progbits
  .type g_pfnVectors, %object
  .size g_pfnVectors, .-g_pfnVectors


g_pfnVectors:
  .word  _estack                           /* Top of Stack                     */
  .word  Reset_Handler                     /* Reset Handler                    */
  .word  NMI_Handler                       /* NMI Handler                      */
  .word  HardFault_Handler                 /* Hard Fault Handler               */
  .word  0                                 /* Reserved                         */
  .word  0                                 /* Reserved                         */
  .word  0                                 /* Reserved                         */
  .word  0                                 /* Reserved                         */
  .word  0                                 /* Reserved                         */
  .word  0                                 /* Reserved                         */
  .word  0                                 /* Reserved                         */
  .word  SVC_Handler                       /* SVCall Handler                   */
  .word  0                                 /* Reserved                         */
  .word  0                                 /* Reserved                         */
  .word  PendSV_Handler                    /* PendSV Handler                   */
  .word  SysTick_Handler                   /* SysTick Handler                  */

  /* external interrupts handler */
  .word  WWDGT_IRQHandler                  /* 16: Window WatchDog              */
  .word  LVD_IRQHandler                    /* 17: LVD through EXTI Line detect */
  .word  RTC_IRQHandler                    /* 18: RTC through the EXTI line    */
  .word  FMC_IRQHandler                    /* 19: FMC                          */
  .word  RCU_IRQHandler                    /* 20: RCU                          */
  .word  EXTI0_1_IRQHandler                /* 21: EXTI Line 0 and 1            */
  .word  EXTI2_3_IRQHandler                /* 22: EXTI Line 2 and 3            */
  .word  EXTI4_15_IRQHandler               /* 23: EXTI Line 4 to 15            */
  .word  0                                 /* Reserved                         */
  .word  DMA_Channel0_IRQHandler           /* 25: DMA Channel 0                */
  .word  DMA_Channel1_2_IRQHandler         /* 26: DMA Channel 1 and Channel 2  */
  .word  DMA_Channel3_4_IRQHandler         /* 27: DMA Channel 3 and Channel 4  */
  .word  ADC_CMP_IRQHandler                /* 28: ADC and Comparator           */
  .word  TIMER0_BRK_UP_TRG_COM_IRQHandler  /* 29: TIMER0 Break, Update, Trigger and Commutation */
  .word  TIMER0_Channel_IRQHandler         /* 30: TIMER0 Channel Capture Compare                */
  .word  0                                 /* Reserved                         */
  .word  TIMER2_IRQHandler                 /* 32: TIMER2                       */
  .word  TIMER5_IRQHandler                 /* 33: TIMER5                       */
  .word  0                                 /* Reserved                         */
  .word  TIMER13_IRQHandler                /* 35: TIMER13                      */
  .word  TIMER14_IRQHandler                /* 36: TIMER14                      */
  .word  TIMER15_IRQHandler                /* 37: TIMER15                      */
  .word  TIMER16_IRQHandler                /* 38: TIMER16                      */
  .word  I2C0_EV_IRQHandler                /* 39: I2C0 Event                   */
  .word  I2C1_EV_IRQHandler                /* 40: I2C1 Event                   */
  .word  SPI0_IRQHandler                   /* 41: SPI0                         */
  .word  SPI1_IRQHandler                   /* 42: SPI1                         */
  .word  USART0_IRQHandler                 /* 43: USART0                       */
  .word  USART1_IRQHandler                 /* 44: USART1                       */
  .word  0                                 /* Reserved                         */
  .word  0                                 /* Reserved                         */
  .word  0                                 /* Reserved                         */
  .word  I2C0_ER_IRQHandler                /* 48: I2C0 Error                   */
  .word  0                                 /* Reserved                         */
  .word  I2C1_ER_IRQHandler                /* 50: I2C1 Error                   */

/*******************************************************************************
*
* Provide weak aliases for each Exception handler to the Default_Handler.
* As they are weak aliases, any function with the same name will override
* this definition.
*
*******************************************************************************/

  .weak      NMI_Handler
  .thumb_set NMI_Handler,Default_Handler

  .weak      HardFault_Handler
  .thumb_set HardFault_Handler,Default_Handler

  .weak      SVC_Handler
  .thumb_set SVC_Handler,Default_Handler

  .weak      PendSV_Handler
  .thumb_set PendSV_Handler,Default_Handler

  .weak      SysTick_Handler
  .thumb_set SysTick_Handler,Default_Handler

  .weak      WWDGT_IRQHandler
  .thumb_set WWDGT_IRQHandler,Default_Handler

  .weak      LVD_IRQHandler
  .thumb_set LVD_IRQHandler,Default_Handler

  .weak      RTC_IRQHandler
  .thumb_set RTC_IRQHandler,Default_Handler

  .weak      FMC_IRQHandler
  .thumb_set FMC_IRQHandler,Default_Handler

  .weak      RCU_IRQHandler
  .thumb_set RCU_IRQHandler,Default_Handler

  .weak      EXTI0_1_IRQHandler
  .thumb_set EXTI0_1_IRQHandler,Default_Handler

  .weak      EXTI2_3_IRQHandler
  .thumb_set EXTI2_3_IRQHandler,Default_Handler

  .weak      EXTI4_15_IRQHandler
  .thumb_set EXTI4_15_IRQHandler,Default_Handler

  .weak      DMA_Channel0_IRQHandler
  .thumb_set DMA_Channel0_IRQHandler,Default_Handler

  .weak      DMA_Channel1_2_IRQHandler
  .thumb_set DMA_Channel1_2_IRQHandler,Default_Handler

  .weak      DMA_Channel3_4_IRQHandler
  .thumb_set DMA_Channel3_4_IRQHandler,Default_Handler

  .weak      ADC_CMP_IRQHandler
  .thumb_set ADC_CMP_IRQHandler,Default_Handler

  .weak      TIMER0_BRK_UP_TRG_COM_IRQHandler
  .thumb_set TIMER0_BRK_UP_TRG_COM_IRQHandler,Default_Handler

  .weak      TIMER0_Channel_IRQHandler
  .thumb_set TIMER0_Channel_IRQHandler,Default_Handler

  .weak      TIMER2_IRQHandler
  .thumb_set TIMER2_IRQHandler,Default_Handler

  .weak      TIMER5_IRQHandler
  .thumb_set TIMER5_IRQHandler,Default_Handler

  .weak      TIMER13_IRQHandler
  .thumb_set TIMER13_IRQHandler,Default_Handler

  .weak      TIMER14_IRQHandler
  .thumb_set TIMER14_IRQHandler,Default_Handler

  .weak      TIMER15_IRQHandler
  .thumb_set TIMER15_IRQHandler,Default_Handler

  .weak      TIMER16_IRQHandler
  .thumb_set TIMER16_IRQHandler,Default_Handler

  .weak      I2C0_EV_IRQHandler
  .thumb_set I2C0_EV_IRQHandler,Default_Handler

  .weak      I2C1_EV_IRQHandler
  .thumb_set I2C1_EV_IRQHandler,Default_Handler

  .weak      SPI0_IRQHandler
  .thumb_set SPI0_IRQHandler,Default_Handler

  .weak      SPI1_IRQHandler
  .thumb_set SPI1_IRQHandler,Default_Handler

  .weak      USART0_IRQHandler
  .thumb_set USART0_IRQHandler,Default_Handler

  .weak      USART1_IRQHandler
  .thumb_set USART1_IRQHandler,Default_Handler

  .weak      I2C0_ER_IRQHandler
  .thumb_set I2C0_ER_IRQHandler,Default_Handler

  .weak      I2C1_ER_IRQHandler
  .thumb_set I2C1_ER_IRQHandler,Default_Handler

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

